Visualizing Nucleation and Growth Process of Vanadium‐Supramolecular Nanoribbons Self‐Assembled by Rapid Cooling Method towards High‐Capacity Vanadium Nitride Anode Materials. Issue 13 (15th January 2022)

• Record Type: Journal Article
• Authors: Yang, Yunlong; Wang, Yanqin; Zhao, Lei; Liu, Ying; Ran, Fen
• Is Part Of: Advanced energy materials. Volume 12:Issue 13(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-15
• Subjects: anode materials -- large‐scale fabrication -- metal supramolecules -- nitride metals -- nucleation process -- supercapacitors; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202103158
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: The vanadium‐supramolecules and their derivatives are in high demand because of their huge potential applications in various fields, especially as electrodes for supercapacitors and batteries. However, the complex synthesis process is still a significant challenge. Furthermore, for these self‐assembly processes, the early reaction stages, intermediates, and details of reaction kinetics are still unknown. Here, an efficient approach of rapid cooling for large‐scale fabrication of melamine‐ammonium metavanadate (C3 H6 N6 ‐NH4 VO3 ) supramolecular nanoribbons is reported, and the corresponding nucleation and growth process are visualized by using an in situ polarizing microscope. The thermally induced nucleation takes place within tens of seconds, and once the nucleus is formed, C3 H6 N6 and NH4 VO3 begin to assemble into nanoribbons under thermal control and grow epitaxial around the already‐formed nuclei. The growth process is much slower than the nucleation, until all small molecules are consumed. Rapid heat induction (rapid cooling) and shear force induction (stirring) help to form a uniform and wider 2D sheet rather than fibers or ribbons. After pyrolysis, the vanadium‐supramolecules derived vanadium nitride (VN)/carbon nanoribbons present a mesoporous structure, which endows the VN/carbon with high capacitance of 266.3 F g −1 at 0.5 A g −1 . In addition, the relationship between various structures and their properties is systematically investigated. Abstract : Vanadium‐supramolecular nanoribbons self‐assembled by rapid cooling are proposed and investigated systematically, for example, by direct visualization of the nucleation and growth process via an in situ polarizing microscope. The high efficiency of this approach and the low cost of melamine and ammonium metavanadate help to achieve large‐scale production of high performance vanadium nitride supramolecular nanoribbons which exhibit remarkable capacitance of 266.3 F g −1 at 0.5 A g −1 .